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Size Basic Major Diameter Basic Pitch Diameter Minor Diameter Minor Dia. Area Tensile Stress Area
Size Primary Size Secondary External Thread Internal Thread
inch inch inch inch inch inch sq. inch sq. inch
1*   1.0000 0.9188 0.8512 0.8647 0.551 0.606
  11/16 1.0625 0.9813 0.9137 0.9272 0.636 0.695
11/8   1.1250 1.0438 0.9792 0.9897 0.728 0.790
  13/16 1.1875 1.1063 1.0387 1.0522 0.825 0.892
11/4   1.2500 1.1688 1.1012 1.1147 0.929 1.000
  15/16 1.3125 1.2313 1.1637 1.1772 1.039 1.114
13/8   1.3750 1.2938 1.2262 1.2397 1.155 1.233
  17/16 1.4375 1.3563 1.2887 1.3022 1.277 1.360
11/2   1.5000 1.4188 1.3512 1.3647 1.405 1.492
  19/16 1.5625 1.4813 1.4137 1.4272 1.54 1.63
15/8   1.6250 1.5438 1.4806 1.4897 1.68 1.78
  111/16 1.6875 1.6063 1.5387 1.5522 1.83 1.93
13/4   1.7500 1.6688 1.6012 1.6147 1.98 2.08
  113/16 1.8125 1.7313 1.6637 1.6772 2.14 2.25
17/8   1.8750 1.7938 1.7262 1.7397 2.30 2.41
  115/16 1.9375 1.8563 1.7887 1.8022 2.47 2.59
2   2.0000 1.9188 1.8512 1.8647 2.65 2.77
  21/8 2.1250 2.0438 1.9762 1.9897 3.03 3.15
21/4   2.2500 2.1688 2.1012 2.1147 3.42 3.56
  23/8 2.3750 2.2938 2.2262 2.2397 3.85 3.99
21/2   2.5000 2.4188 2.3512 2.3647 4.29 4.44
  25/8 2.6250 2.5438 2.4762 2.4897 4.76 4.92
23/4   2.7500 3.6688 2.6012 2.6147 5.26 5.43
  27/8 2.8750 2.7938 2.7262 2.7397 5.78 5.95
3   3.0000 2.9188 2.8512 2.8647 6.32 6.51
  31/8 3.1250 3.0438 2.9762 2.9897 6.89 7.08
31/4   3.2500 3.1688 3.1012 3.1147 7.49 7.69
  33/8 3.3750 3.2938 3.2262 3.2397 8.11 8.31
31/2   3.5000 3.4188 3.3512 3.3647 8.75 8.96
  35/8 3.6250 3.5438 3.4762 3.4897 9.42 9.64
33/4   3.7500 3.6688 3.6012 3.6147 10.11 10.34
  37/8 3.8750 3.7938 3.7262 3.7397 10.83 11.06
4   4.0000 3.9188 3.8512 3.8647 11.57 11.81
  41/8 4.1250 4.0438 3.9762 3.9897 12.34 12.59
41/4   4.2500 4.1688 4.1012 4.1147 13.12 13.38
  43/8 4.3750 4.2938 4.2262 4.2397 13.94 14.21
41/2   4.5000 4.4188 4.3512 4.3647 14.78 15.1
  45/8 4.6250 4.5438 4.4762 4.4897 15.6 15.9
43/4   4.7500 4.6688 4.6012 4.6147 16.5 16.8
  47/8 4.8750 4.7938 4.7262 4.7397 17.4 17.7
5   5.0000 4.9188 4.8512 4.8647 18.4 18.7
  51/8 5.1250 5.0438 4.9762 4.9897 19.3 19.7
51/4   5.2500 5.1688 5.1012 5.1147 20.3 20.7
  53/8 5.3750 5.2938 5.2262 5.2397 21.3 21.7
51/2   5.5000 5.4188 5.3512 5.3647 22.4 22.7
  55/8 5.6250 5.5438 5.4762 5.4897 23.4 23.8
53/4   5.7500 5.6688 5.6012 5.6147 24.5 24.9
  57/8 5.8750 5.7938 5.7262 5.7397 25.6 26.0
6   6.0000 5.9188 5.8512 5.8647 26.8 27.1
inch inch inch inch inch inch sq. inch sq. inch
Size Primary Size Secondary Basic Major Diameter Basic Pitch Diameter External Thread Internal Thread Minor Dia. Area Tensile Stress Area
Size Minor Diameter
* Standard Size of the UNC series